Electrical condenser



W. DUBILIER.

ELECTRICAL CONDENSER. APPLICATION FILED AuGIl 191s.

l ,70 E Y/10 I mik nuefwfoz M, Mouw@ UNITED. :STATI-:1s

PATENT olf-Fics.

` vr'LLrm DUBILIEB, or NEW Yonx, N. Y.

To all 'whomit 'may concern:

Be it known that I, WILLIAM DUBrLmR, of New York city, in the county of New York and in the `lState of New York, have invented a certainl new and useful Im-v provement in Electrical Condensers, and. dol

:hereby declare that the followingpis a full,

clear` and exact description thereof.

Prioreortls to'improve the efficiency of electrical co densers have Ybeen directed `mainly toward changes inl'thev dielectric employed with a view to decrease' as much as Ypossible the leakage between .adjacent plates and other dielectric losses, and little attention hasbeen paid to the character of conducting plates or the4 manner in which.

J the charging current Awas led thereto.

This invention has for an object to im prove generally the ,efliciency of condensers where high eiicienciesare necessary; especially in regard to the' character of conducting plates employed and the dispositionof such plates, so as to'eliminate to as great an extent as possible, the losses due to resistance of the plates and uneven current distribution, and so as to obtain advantageous conduction and radiation of heat from the interior ofthe condenser.

Further objects and advantages of the invention will bein part obvious and in part speciically pointed out in the description hereinafter contained, in whichl have disclosed one embodimenty of my invention;

[such embodiment however is to be considered merely as illustrative of its' principle.V f In the drawings:`

Figures 1 an 2 are respectively a plan and side view of a condenser made according to my invention.

A condenser extenslvely used in lwireless apparatus consistsl of-'a lurality of conducting plates of opposite polarity, and

leading in the charging current. The pro- Specication of Letters Patent.

ya very a ELECTRICAL CONDENSER.

' Patented sept. 27, '1921.

Application medug'ulst 1, 191,8. Serial 247,740.

jecting portions also provide a certain amount of heat radiating surface which aids in preventing an excessive rise in temperature within the condenser. The projecting edge portions of similar plates are usually soldered together to provide good conduction of current to each plate.

Such condensers have always been made with the ends of the conducting sheets exposed, since with this arrangement the conducting sheetsv may be more easily placed in position and held therein during manufacture. 1

Condensers of the above type are, however, open to certain objections. In the first place 'the `end edge portions of the conducting lates are' relatively remote from the remalnlng areas of the plates taken as a whole, so that the charging'current must travel aI relatively great distance in covering the areaslof the plates', thusinvolving use vof the condenser. charge of` each plate is very unevenly `distributed over its surface, since the potenpreciable resistance loss, intheI` Furthermore the tial will be lowest at the projecting porl tion of each plate where the charging current is led in, and will increase steadily until it reaches a maximum at the inner end of the' plate, where the charging lcurrent is zero. In other words the potential differencebetween the ends of the plates is as great as'could be in that shape of condenser. Again, the projecting portions of the conducting plates, being remote from the hottest portions of thel condenser, necessitate a relatively long path of ltravel for'thefheat to conducted over, before reaching the edge portionsso that it may be radiated therefrom. The terminal strips engage the i plates along their shortersides, so that the :contact area through which the charging currentV must pass, is relatively small, thus bringing about a. further increase in resistance losses.

'j In order `toI provide a condenser which avoids the above disadvantages I have made use of the-princi les embodied in the condenser shown in ig's. 1 and 2.- As shown therein, conducting plates 8 and 9 are'employed in connection with the insulating sions Asimilar to those of the type previously described. Infthis instance, however,- the end edges of the plates 8 and 9 arecntained within the outlines of the'insulating `sheets 10 forming a condenser of dimenlbe one-half. j edge portions 11 and 12 being twice as great y tions 11 and 12 are respectively soldered together, in the form disclosed, in order to provide suitableterminal connection for leading in the charging current.

y It will be noted that, in this latter form ofl j condenser, the distance necessary for the charging current to travel in covering the area of the plates ina condenser `of given dimensions, is much reduced. Forv instance, if the length of. the insulating sheets` is twice their width, the distance necessary to be traveled b the charging(current, will T e lengthl of the projecting as thatj'of similar portions of previous structures, the cross sectional area through which the charging current passes in traveling fromv terminal strips over the surfaces of theplates, will be twice as greatin the prior art. The ohmic losses will, therefore, be reduced to onevquarterinv the example taken, owing to .the reduction in path of travel ofthe charging current and the increase in4 cross sectional area of the plate in the direction of which it travels. ,The

distribution of' charge over the surfaces of plates 11 and 12 will be twiceas uniform as in the structure of the prior art, owing to the vfact that the charge varies across the width of the plates,'instead ofv along,

their lengths. Th

tions 11 and 12, being relatively close to the interior of the condenser, do notfneces sltate as great adistance ,of travel of the h eat in being conducted to such edge portions, and the heat is also more readily radiated from the exposed portions 11 `and 12, owing to their greater area. By actual comparative tests of the above two types of condensers it has been established that, over a period of three hours, the temperature risepf a condenser of given dimensions of the old type is about 30, While in a con denser ofv similar dimensions of the type shown in Figs. 1 and 2, atem erature rise only of about 5 occurs. ASuc a reduced rise intemperature is made possible owing heat losses within the condenser, and the im roved facilities for conducting and ra iatingaway the heat which is develo ed therein. It khas been found that the above results may be obtained with condensers of widely differing dimensions, the gain in efficiency varying in ra general sense, in proportion to the ratio ofi plate. length tovvplate width. 'Ihe dimensions of a condenser for an glven purpose must be determined by strike projecting edge por-v and insulating sheets ing a balance between the practical requirements as tothe dimensions of the condenser, and rthe gain in efficiency' which may be effected, by the use of the principles above described. A

While 1 have described a specific form of my invention it is obvious that many changes may be made without departing from the principle thereof, as defined in the following claims. c

I claim:

1. A high tension stacked condenser comprising a plurality of rectangular flat comducting plates having one dimension of substantially greater length than the other inte-rleaved'withv larger rectangular insulating sheets, of greater length than width, side edge portionsl of -the longer dimension of such plates projecting alternatelybeyond the two longer sides of `rid insulating sheets,'and similarly projecting edge portions .o such plates being bound together substantially throughout their whole width, to constitute terminals for the condenser.

2. A high tension stacked condenser comprising a plurality `of polygonal plates, conducting plates each having an edge portion of substantially greater length than adjacent edge portions and insulating sheets disposed between the same, the edge portions of said plates whichI are of' greatest length projecting laterally beyond said insulating .sheets and 'terminal connections leading edge -of substantially .greater length than adjacent side edges and `insulating sheets disposed between the same, a side edge of the greater length of each of said plates projecting `laterally beyond sheets and terminal connections leading to substantially the whole width of each of said rejecting edges. j

4. high tension stacked condenser comprising a plurality of fiat conducting plates, each having an edge portion of substantially greater length than adjacent edge portions, and insulatlng sheets disposed between the same, the said conducting plates and insulating sheets being so alternately stacked as to project the edge portions of greater length of said plates laterally beyond said insulating sheets wherebyy exposed terminal portions of said plates lare presented providingthe shortest mean heat conduction path to the exterior of the condenser.

5. A high tension stacked condenser comprising a pluralit of fiat conducting plates, each having an e ge portion of substantially greater length'than adjacent edge portions, disposed between the same, thesaid conducting plates and insusaid insulating 15391,:572 I s 3i I lating. sheets being so alternately stacked plates are presented providing the shortest as to project the edge portions of greater mean heat conducting path to the exterior n length of said plates laterally beyond said of the condenser and the pathof lowest 10 insulating sheets, and terminal connections mean resistance. y

5 leading to substantially the Whole width of In testimony that I claim the foregoing eachof said projecting edgev portions, I have hereunto set m hand. whereby exposed terminal portions of said WILL AM DUBILIER. 

